Mutations in GRK2 cause Jeune syndrome by impairing Hedgehog and canonical Wnt signaling.

Abstract:

:Mutations in genes affecting primary cilia cause ciliopathies, a diverse group of disorders often affecting skeletal development. This includes Jeune syndrome or asphyxiating thoracic dystrophy (ATD), an autosomal recessive skeletal disorder. Unraveling the responsible molecular pathology helps illuminate mechanisms responsible for functional primary cilia. We identified two families with ATD caused by loss-of-function mutations in the gene encoding adrenergic receptor kinase 1 (ADRBK1 or GRK2). GRK2 cells from an affected individual homozygous for the p.R158* mutation resulted in loss of GRK2, and disrupted chondrocyte growth and differentiation in the cartilage growth plate. GRK2 null cells displayed normal cilia morphology, yet loss of GRK2 compromised cilia-based signaling of Hedgehog (Hh) pathway. Canonical Wnt signaling was also impaired, manifested as a failure to respond to Wnt ligand due to impaired phosphorylation of the Wnt co-receptor LRP6. We have identified GRK2 as an essential regulator of skeletogenesis and demonstrate how both Hh and Wnt signaling mechanistically contribute to skeletal ciliopathies.

journal_name

EMBO Mol Med

journal_title

EMBO molecular medicine

authors

Bosakova M,Abraham SP,Nita A,Hruba E,Buchtova M,Taylor SP,Duran I,Martin J,Svozilova K,Barta T,Varecha M,Balek L,Kohoutek J,Radaszkiewicz T,Pusapati GV,Bryja V,Rush ET,Thiffault I,Nickerson DA,Bamshad MJ,Universit

doi

10.15252/emmm.201911739

subject

Has Abstract

pub_date

2020-11-06 00:00:00

pages

e11739

issue

11

eissn

1757-4676

issn

1757-4684

journal_volume

12

pub_type

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